Its typically a good idea to play less and study more during "downswings".
Just want to elaborate a bit more on the point about studying. When I played cash games and experienced large samples, where I was losing, I would take that whole sample and sort the hands in PT4, so that the largest losing hands appeared on top. This could be for instance a sample like 20.000 hands from 10NL Zoom or 25.000 hands from 5NL full ring.
And then I would painstakingly look at each of these big losing hands in the replayer. Some of them might be weeks or even month old, which mean, I was now emotionally detached from the result and able to look at the hand more objectively. And then I would make up my mind, if it was really just bad luck, or if maybe I lost more, than I should. And more often than not I would find at least some hands, that I would have to classify as bad (tilted) calls or bluffs. Hands, where I fought to much for the pot, and it would have been much better to simply fold and cut my losses.
The next step, I took later on, was to purchase PokerSnowie and import some of those big losing hands into the program, to get the programs feedback on, where I made the biggest mistakes from its GTO sort of perspective. That might be a spot, where I faced a turn check-raise, and to my surprice Snowie would not even have bet the turn. Or it could be a big call on the river, where its typically safe to say, that if Snowie wants to fold, then we should certainly not call against an average microstakes opponent.
For tournaments the main tool, I use to review hands, is ICMizer, since push-fold spots tend to be very important in tournaments. You can mark hands, you are unsure about, right after they happen, and then import them for review after the session one by one. Or you can take all the hands from a tournament or even a session, if you have played identical tournaments like say 9-man SnGs, and then let the program analyse all of them and list them with your biggest mistakes at the top.
These are just some examples of, how study can be done. The main point is to actually do it, and be honest with yourself about the fact, that maybe you did not play every single hand perfect. The worst thing, you can do, is to fall into the trap of feeling like a victim, just because you have been unlucky in some spots and/or have lost some money. The statement "I am in a downswing" can easily end up being an excuse for:
1) Not working seriously on your game
2) Continuing to make bad (tilted) plays losing you even more
3) Not following bankroll management and moving down when needed
4) Not questioning if you are playing in the right games