Keeping on top of kit repairs is pretty straight forward and a little bit of TLC could prevent the damage getting worse.
Holes in most stuff can be repaired with Stormseal which is a clear flexible glue. I’d avoid the larger tubes as this stuff will go-off once opened. Keeping it in the fridge will help but you can get packs of 3 x 5g tubes which are superb.
Once in a while your kit gets to a point where it is no longer safe to use or it simply doesn’t do its job as well as it should. When it does it is time to get rid.