I recently cleared grift 65 solo on my season wizard, at paragon 610 or so - jumping up into the top 300 leaderboard for wizard (EU). I am not really able to farm paragon, because I've seen how pros do it (grifts, exp gear, multiplicative etc, some farm exp pools before doing so, can speed grift 65+) and paragon just flies up, so I feel like I'm wasting time.
And leaderboards are dominated by paragon levels, in addition to botters who have limitless amounts of equipment to keep trying for near-perfect items.
So, yeah - a bit disheartened at some point, feeling as a primarily solo player I hit a ceiling, and would only be able to chase top 100 wizard leaderboards if I join a very serious clan.