You LST'd, so that;s normal.
it seems like it isn't growing as much, but it really growing more spread out than before.. as the canopy expands and roots to support it.. growth will explode in no time.
removing overlapping leaves can help... and axillary growth that is not part of your plans prune off... the plant will perk up for sure. *autoflower, so this is much less likely the case.. so, just get leaves out of the way for vertical growth of all axillary shoots...
leave at minimum 1 leaf at each node if you can.. this early it'll grow back.