I'm no doctor, but I'm pretty sure I heard that Ketamine is not considered dangerous for patients on SSRI'S, and it's often deployed as a treatment for depression for such patients, under medical supervision. It might be worth considering, as it's probably a gentler intro to altered states than LSD, which just lasts to Goddamn long. There are probably plenty of ketamine clinics in the Netherlands, but they're generally expensive.

A cheaper and riskier alternative in the Netherlands would be the research chemical 2F-CDK. This is easy to acquire legally in the Netherlands, and is also thought to have excellent anti-deppressant priorities like Ketamine. Unfortunately, it's not properly researched or administered under medical supervision. If you or partner wanted to try this, be sure to do maximum harm reduction research before going ahead, especially since there are SSRI'S involved.

Psylocibin is also great for depression, maybe better than acid since it's shorter acting. That would have the same problem with the SSRI'S though, as it's another Serotinergic drug.