Step 1 should be to try and identify the source of the burn-out.
Step 2 should be to come up with a short-term remediation.
Step 3 should be to come up with a long-term remediation.
You mentioned that recent long holiday weekends hasn't been enough. It's possible that it's not time-off that's the issue but something different. (It's also possible that holiday long weekends are MORE stressful than work.)
There are a variety of different stressors that could cause burn-out:
- Insufficient days off
- Long hours
- Insufficient breaks throughout the day
- Increased or overwhelming responsibility
- Work that is too challenging
- Work that is not challenging enough
- Interpersonal issues with co-workers
- Issues outside of work (problems in our non-work lives often manifest at work - relationship problems, money problems, housing concerns, car trouble, etc.)
- Time off from work doesn't provide the opportunity to actually decompress
- A medical issue (depression often manifests this way)
Step 1: Talk to someone in your personal support system (a spouse, parent, friend, mentor, etc.) or a professional about what's been going on.
- If your company has something like an Employee Assistance Program, they may be able to help give advice (many large companies offer these benefits free of charge, but few employees take advantage).
- A therapist is a great resource for helping discuss these kinds of issues. (I burnt out about 7 years ago and a few months of regularly seeing a therapist did wonders for me)
Step 2: You now have some understanding of the underlying problem. Work with your boss/manager/family to come up with a short-term accommodation.
Maybe that's just powering through until your scheduled time off, maybe it's an adjustment to hours or responsibility in the near-term. Maybe it's the next couple Wednesday's off (I find that two-day weeks are easier when you're burnt out than 4 day weeks. The extra day of recuperation isn't adding as much.) Maybe it's a Saturday to yourself doing something you enjoy.
Step 3: Find a long-term, sustainable solution. It could mean a job change (internal or external), a permanent change in hours, a regularly scheduled long weekend, a quarterly Wednesday spa day, a new hobby, ending a toxic relationship, meditation, medication, etc.