Ive recently gained 13 subscribers, in the last month. Before that I didn't grow at all, I think the most important thing is to just do videos YOU want to do, not just videos you think your subs would like, the more comfortable and happy you are doing videos, the more people will enjoy them and get to know you as well, i always try and use humour in all my videos, so even if it seems like a boring subject, i am talking about I hopefully will still make someone laugh, so that they would still want to watch it knowing my personality. I also think uploading at least once a week and being a lot more active also helped with that, and joining this forum of course!
I also recently learnt how to do end title card, which is what most big youtubers do at the end of each video, that shows a clip of their previous video then you link to it in the annotations, some youtubers also do a random video and a previous video, but I just link to my previous video with a clip and music, then have a big subscribe next to it linking to my channel, I will not say my end title card is proffessional looking because it's not it's very basic, as I have only just learnt how to do it but it does it's job, and if someone enjoyed that video and reached the end, they may be tempted to watch the previous video too.
I also have a watermark at the bottom of each video, where if someone hover over it, it says how many subs I have, and then you can directly sub by clicking the subscribe button. No editing is involved in this, you can either use your current youtube profile picture like I have, or create a photo to use as a watermark, then go into your settings on youtube and find watermark, and add it, and youtube automatically adds it to all your previous videos, and the future ones you make. I find this really useful as I have had some people automatically sub to me by watching one or two videos then just using the watermark rather then going to my channel.
Try and end your videos asking people to subscribe, like and comment etc, and if possible tell them what kind of videos are coming up next for your channel, to try and entice them into subscribing for example I mention the fact I have a big freshers guide to series coming up where I will (try) to do videos all through freshers week as i live it (as a second year haha) giving people tips and tricks to get through first year and university, and do channel updates these can be just quick videos mentioning it or add it to the end of a video you have already done, if you are not going to be able to upload or something for a while, so your subscribers know whats going on, for example my latest video was also a channel update as I am busy moving back to uni, so had to tell people I may be a bit slow in uploading so not to unsub due to inactivity.
I am not a big youtuber by any means but this is what I do, and it has kinda worked so I hope some of this helps

You don't need a great camera or equipment, sometimes just having a great personality and doing good videos are just as good as all these expensive well thought out videos big youtubers can do!