How do you get motivation?

I was on SSRIs for a few months and they did help but only very slightly, after some months I went back to not feeling too motivated to do the things I used to enjoy doing, I tried modafinil as well and did exactly zero for me, I know it's not a motivation aid but it didn't help my focus or anything whatsoever, no results at all. How do you manage to stay motivated when you're really not feeling it? I know discipline is the general answer but there are times when that really ain't enough, luckily I'm doing better now motivation wise but I don't wanna fall back into that rut, any advice on how to stay motivated and get back on track when you feel like doing nothing?