Before I became a serious Intraday trader, I used to trade on multiple time frames.
Yes, some trades were scalps, some intra-day swings, some positional trades as well thrown in. The net result always had been in Red. The combinations would be different though, Green on Intraday / Red on Positional or vice versa.
The real consistency in my P/L happened only after I stopped participating in Sprints and Marathons parallel-ly. I realized marathons are not for me.
The idea I am trying to point to is, the probabilities and the risks associated with trading in different time frames is very different. And its humanly impossible to do justice to both as one lone retail trader. Yes, if you have a team to work with, each with their own specialization, its a different ballgame.
Not recommending, but what has worked for me, given my limited resources and disposition is to focus only on Intraday time frame.
Think about your losses and red days, and see if mixing time-frames is the culprit.