The most important thing right is that RC Lens now have the lead and it's left for them to decide their fate considering the title race, I believe they know what's at stake and what PSG can do if they make any mistakes within these period. PSG on the other would be also looking out for opportunities to get back to the top as soon as possible which means we might have a very close race between the winner of the title and the runner up at the end of the season hopefully.
Consistency is really needed by Lens because leading the first standings with a point difference that is so close is not safe for the issue of winning the title. PSG themselves will also try to do everything to reach first place in the standings and I don't think it will be difficult for them to reach first place again. There are still a lot of matches left so it won't be difficult for PSG to shift Lens' position at the top of the standings and if Lens doesn't perform optimally in the remaining matches then that position will again be a struggle between PSG and Lens.
Consistency could be the only determining factor that might help RC Lens if they must clinch this title, as a matter fact being consistent is the only chance they have right now at winning the French ligue1 title because PSG will be looking out for any mistakes by lens to capitalise on in order to reclaim the top position but if only RC Lens can stay focused then they might do the impossible because PSG already have other engagements like the UCL which might also distract them from the title race.