SEP IRA and ROTH IRA

Hi

 

I'm a 62-year-old self-employed man, and I have a SEP IRA account.

Early this year I contributed $8,000 to my ROTH IRA without thinking about tax deductions. 

Can I still contribute to the SEP IRA for tax deductions or have I already maxed out my contributions for this year? If I can't, any other tax deductable contributions?