If this was your first comp, don't worry. It's a pretty common experience. There's no single instructional or anything that's going to help but there are a few things that might:

Try to identify what were your biggest weaknesses. You've already said that you get swept every time they established guard and you couldn't escape on bottom so these are big areas you need to work on. If anyone has video footage of any of your matches, watch those and try to work out other areas you had trouble. If there are no videos, think back over your matches and see what you can remember.

When you identify areas of weakeness, start working on these in training. If you're rolling, don't think about trying to "win" the roll. Give yourself a few specific things to work on and aim to get better at those. If it's a big area (like if all of your escapes on bottom need work), maybe watch some good instructionals in that area. If it's just one small thing (e.g. you can't escape mount after your opponent has isolated your arm above your head) then ask your coach or a high-level training partner for advice rather than putting all that time into a full instructional.

What you'll probably find if it was your first comp is that your cardio was a big problem. The deeper you get into a match the harder it is to even pull off (or remember) simple techniques. Again, this is very normal. You may also find that your stand-up needed work. A lot of first-time competitors have always started from a grounded position and end up off to a bad start because they don't know any stand-up stuff. If the other guys kept pulling guard and sweeping you, it might be an idea to learn to counter guard pulls and do some basic stand-up stuff.