Ill try

your micro seems really good to me but
1.you lost too many inf squads (the main reason you lost, simple as that

)
2. you invested 200 mp in a pioneer at a point where your opponent was outnumbering you just to repair your Scout Car even though you had another one capping in the north
3.i dont exactly remember but i think you upgunned your ac ? you should rather get a lmg or a tellermine
youre opponent was just slightly better than you (no shame since hes top 100 or something like that). All the full unit kills Rafa did early on decided the game imo.