No. Trials are no longer offered at all, so there is nothing to restart. Accounts that used a trial in the past cannot start another one, and new subscriptions are charged at checkout instead of starting a trial.
What you can do instead
Use the free journal for as long as you want. It is the whole product minus Mentor AI, it needs no card, and it does not expire — so it serves the purpose a trial used to. See Free version vs paid Mentor AI.
When you are ready for Mentor AI, subscribe from Settings > Subscription. If it is not for you, cancel before the next renewal to stop future charges. Payments already taken are not refunded.
If a trial is still running on your account
Trials that began before trials were discontinued still run to their end date, and can still be extended once from the cancel flow. See Can I get a trial extension?.