1st person singular future indicative; upasaṅkamissāmi + iti (reported speech)
Analysis. upasaṅkamissāmi-iti: future stem upasaṅkamissa- (I shall approach) + iti (quotative particle, 'thinking' or 'saying'), marking indirect speech or mental resolve.
Etymology. upa- (up close to, near, alongside; Latin sub-, Greek hypo-) + saṅ- (together, with; Latin con-) + √kam (go, come; cognate with English come, Greek bathos 'depth' via IE *gʰem-). The two prefixes stack concretely: drawing near and gathering oneself together to go toward.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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