tented, he is talking about how bad he finished in the USO 2018, then after to be almost 5 months out he played well in the AO but not enough well against Novak, then 5 days before Acapulco he got problems with his wrist, then he started playing not too good in clay season and very down mentality but after Barcelona he decided to change his mind trying to play better and more positive helping him to arrive at RG with more confidence same like at the USO 2019. Later he was talking about soccer...you know B-)
To add just a little more detail, he talked about how he always wants to feel that he's left his best out there, and when he's felt less than motivated, he even looks at videos on the internet of good moments in his career, good wins, and then he says, "Well, I've done it before, I can do it again." (I thought that was kind of fun to know that he looks at those videos, too.) During the clay season last year, as you translated, he was feeling down about his level and his motivation, so he thought long and hard about stopping, but decided to press on and try to let himself find his level and his motivation, which he did. Also mentions that he and Roger have an exhibition match in (Kuwait?) in which they will try to break the record for attendance? And yes, a lot of soccer.
PS:
@tented The interview is in Spanish, not Catalan.