Don't overdo it! Try maybe two sessions, one in the morning and one in the evening, each an hour long. Otherwise, maintain mindfulness in your daily life and practice the rest of the Eightfold Path earnestly; that's a surefire way to progress. Retreats are great but a consistent, energetic but compassionate daily practice is more important in the long run anyway.
Wish you the best!
Gain and loss, status and disgrace,
censure and praise, pleasure and pain:
these conditions among human beings are inconstant,
impermanent, subject to change.
Knowing this, the wise person, mindful,
ponders these changing conditions.
Desirable things don’t charm the mind,
undesirable ones bring no resistance.
His welcoming and rebelling are scattered,
gone to their end,
do not exist.
- Lokavipatti Sutta